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“He comes on and manages to pull three really good saves off. There are plenty of stories like that in football and I am sure it’s a night he won’t forget in a long time.”

United substitute Aliou Traore was shown a straight red in extra-time for an off-the-ball altercation with Max Bird, and they finished the game with nine men when Tahith Chong suffered a nasty-looking injury and had to be stretchered off.

It is now 11 unbeaten in all competitions for Derby but, despite knocking out the 10-time winners of the competition, Delap played down FA Cup targets.

When asked how far his side could go in the competition, Delap replied: “Let’s put that to bed for now, if I’m honest.

Derby County u18s v Manchester United u18s (Image: Andy Clarke)

“The lads worked extremely hard since they have come in for pre-season.

“We’ve got another three or four days of training going into next week and then they will have some deserved time off over Christmas to spend with their families.

“They need the rest mentally and physically, but then come back and be ready for the first game in January against Liverpool.”

Derby face a trip to Norwich City in the fourth round of the FA Youth Cup.